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I contacted Flowmaster a couple of years ago on this
subject and they said that one big exhaust was much
better as far as reducing back presure and increasing
overall performance as compared to a dual exhaust.
This is from the cat back. The old saying is " Bigger
is Better" I will probably go with the cat back BullyDog
exhaust in the spring.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.